Different ways to say to be angry and to be annoyed

It really riling me up when people don't knock before get into my room. It really riles me up... or:  It really riled me up... 

I was already irked when I found her at my home but her arrogancy was the last straw.

I lost my temper/rag when I found out that my brother was dating with my best friend. (Maybe “lost my rag” is a term used in other countries, but I’ve never heard anyone in the USA say it and I don’t know if people here would really understand that phrase if you did use it)

I was at the end of my tether when my sister ate my cake.

I really piss my Italian teacher off as she is always looking at me with a weak smile. There’s something about this sentence... I think it’s technically correct, and the first part “I really piss my Italian teacher off” sounds really natural, but the second part doesn’t. I can’t think how to change it at this time though, but it still gets the point across so that’s good :) 

I flew off the handle for because my offer was rejected again and again.

Different ways to say to be angry and to be annoyed

It really riles riling me up when people don't knock before coming get into my room.

I was already irked when I found her at my home but her arrogance arrogancy was the last straw.

I lost my temper/rag when I found my brother was dating with my best friend.

I was at the end of my tether when my sister ate my cake.

I really piss my Italian teacher off as she always looks looking at me with a weak smile.

I flew off the handle when for my offer was rejected again and again.

It is really riling me up when people don't knock before entering into my room. I was already irked when I found her at my home, but her arrogancy was the last straw. I lost my temper/rag when I found my brother was dating with my best friend. I was at the end of my rope when my sister ate my cake. I really pissed my Italian teacher off as she is always looking at me with a weak smile. I flew off the handle because my offer was rejected again and again.